JFairman- What bad heat soak problems into the CIS injectors will I experience if I go without the heat inulators and just use the thicker than stock gaskets I have?

No one has ever actually said what will the problem(s) you will experience actually be.

If you have a stock fitting intercooler that extra 10mm is going to cause you some fitment issues at the throttle body, if it's not you'll still have to make up the extra cm somewhere. A machine shop could do the blocks in no time at all and likely for little cost relative to shifting components up or down 10mm.
Can't speak on the heat soak issue...